Abstract
The 173K structures of the α, β and γ phases of o-ethoxy-trans-cinnamic acid (OETCA), which crystallize in P 1 ̄ , R 3 ̄ and C 2/c respectively, are reported here. The common building block in all the structures is hydrogen bonded OETCA R 2 2(8) centrosymmetric dimer pairs. The α polymorph forms a layered structure and the γ polymorph a herringbone structure. Both of these phases are made up of hydrogen bonded OETCA dimers that are further assembled through C-H· · · O interactions to form layers or ribbons of OETCA molecules. The main difference between these structures is the 3-D assembly of the layers. The β phase is actually a benzene solvate or host–guest complex (1:6 benzene: OETCA). Benzene, which occupies the 3 ̄ site at (0,0,1/2) in the trigonal unit cell, is essential for the stabilization of this phase. It provides a template for the spiral arrangement of the OETCA molecules required for the formation of the β-photo-dimerization product.
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